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Figure 6-Condensation control scheme with well water
1
From the main condenser pump
2
Service valve
3
Direct acting water regulating valve
4
Configuration required when the regulating valve is not used
5
At Drain
2.12 Chilled water control sensor
The water cooled EWWH VZ unit is equipped with a microprocessor. Be careful when working around the unit to avoid
damaging cables and sensors. Check cables before starting the unit. Prevent rubbing of the cables on the frame or other
components. Make sure the cables are securely locked. If the temperature sensor is removed for maintenance, do not
eliminate the conductive paste in the well and replace the sensor correctly. After replacing the sensor, tighten the lock nut to
prevent accidental slipping.
2.13 Safety Valve
Each exchanger (evaporator and condenser) is provided with a safety valve installed on a changeover valve that allows
maintenance and periodic checks, without losing a significant amount of refrigerant. Do not leave the safety valve in the
intermediate position.
To prevent damages due to inhalation and direct contact with refrigerant gas, the safety valve
outlets must be connected with a conveyor pipe before operations. These pipes must be installed
so that, in case the valve opens, the discharged refrigerant flow not invest people and/or things, or
can enter the building through windows and/or other openings. The installer is responsible for
connecting the safety valve to the purge pipe and pipe dimensioning. In this regard, refer to the
harmonized standard EN13136 to dimension the drain pipes to be connected to the safety valves
2.14 Open the isolation and/or shut off valves
Before powering the machine and thus starting the compressors, open all valves that were closed at the factory for shipping.
The valves to be opened are:
1. Valve (optional) installed on the compressor line
2. Oil return pipe shutoff valves (jet pump). These valves are positioned below the evaporator sleeve in the vicinity of
the jet pump.
3. Liquid line valve installed under the condenser.
4. Oil valves installed on the line that feeds the compressor lubrication system. This line comes from the bottom of the
oil separator located inside the condenser.
5. Valve (optional) installed on the compressor pump line.
2.15 Electrical connections
The unit must be connected with in the proper section copper cables relative to the plate absorption values and in
accordance with applicable electrical regulations.
Daikin Applied Europe SpA cannot be held liable for improper electrical connections.
The connections to the terminals must be made with copper terminals and cables.
The electrical connection must be made by qualified personnel.
There is a risk of electric shock
The electrical panel must be connected keeping the correct phase sequence.
2.16 Phase imbalance
In a three-phase system, excessive imbalance between the phases is the cause of motor overheating. The maximum
allowed voltage imbalance is 2%, calculated as follows:
𝐼𝑚𝑏𝑎𝑙𝑎𝑛𝑐𝑒 % =
(𝑉𝑥 − 𝑉𝑚) ∗ 100
𝑉𝑚
Vx = phase with greatest imbalance
Vm = average of the voltages
